CHAPTER 3 FUNCTIONAL OUTLINE
PRELIMINARY
NEC confidential and Proprietary
75
(h) Packet Extracting from SONET payload on HALT mode
The
µ
PD98413 supports the HALT mode, which enables to receive the fragmentary packet.
In default, this mode is disabled. It can be enable by the HALTM bit of the MOPOSR register. The data “7Dh-xxh”
is terminal flag for the partial packet. If this flag is asserted, the packet extract is paused. Then if expect data
except “7E”, that data is recognized as the next partial packet.
Figure 3-26. Packet Extracting on HALT mode
Address
Control
Partial packet
7Eh
FCS
7Dh-xxh
7Eh
7Eh
Partial packet
7Eh
7Eh
partial packet
7Dh-xxh
Flag sequence
Address
Control
Partial packet
FCS
Extructing Packet
Flag sequence
Flag sequence
Flag sequence
Terminal of Partial paket
Terminal of Partial paket
Partial packet
Partial packet
Flag sequence
Name Value
Flag sequence
7Eh
Terminal of Partial paket
7Dh-xxh
(xx is the value, which set by the STPN[7:0] bits of the HPTNR register.)
Summary of Contents for NEASCOT-P65
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Page 166: ...CHAPTER 5 REGISTERS PRELIMINARY NEC confidential and Proprietary 166 5 2 Register summary ...
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